Northwest Passage Nearly Open, reports NASA

Northwest Passage Nearly Open, reports NASA
NASA Earth Observatory
August 28, 2007

The fabeled Northwest Passage is nearly open, with implications for trade and natural resource exploitation, reports NASA.

In 1497, English King Henry VII sent Italian explorer John Cabot to look for a northwest route from Europe to the Orient that would keep ships from having to sail all the way around Africa. That expedition launched roughly five centuries of steady disappointment and tragedy as generations of explorers—Sir Francis Drake and Captain James Cook among them—met with failure as they searched for the fabled Northwest Passage. Even in modern times, navigating from the Atlantic to the Pacific through Canada's Arctic Islands has been difficult. The summer of 2007, however, saw sufficient sea ice retreat to change the character of the fabled sea route.

This image shows sea ice around the Northwest Passage as observed by the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) aboard NASA's Aqua satellite on August 22, 2007. In this image, blue indicates open water, white indicates high sea ice concentration, and turquoise indicates loosely packed sea ice. The black circle at the North Pole indicates no data as the satellite does not make observations that far north. McClure Strait, Parry Channel, Victoria Strait, and McClintock Channel (north of Victoria Strait), all appear nearly ice-free. North of McClure Strait, an area of sea ice remains, but it is fragmented.

NASA image created by Jesse Allen, using data obtained courtesy of the National Snow and Ice Data Center (NSIDC). Thanks to Walt Meier, NSIDC; and John Falkingham, Environment Canada - Canadian Ice Service for image interpretation.

Multi-year ice (ice that survives more than one melt season) tends to be thicker and more resistant to melt than first-year ice (formed over just one winter). According to John Falkingham of the Canadian Ice Service, most of the multi-year ice melted from Victoria Strait and McClintock Channel in the summer of 2006, leaving these traditionally difficult areas more open. In mid-August 2007, only patchy areas of ice filled Victoria Strait and Larsen Sound, immediately to the north. Falkingham described the Northwest Passage as "nearly open." Changes in the Northwest Passage were part of a larger pattern of melt in 2007 that also affected the East Siberian Sea.

Although nearly open, the Northwest Passage was not necessarily easy to navigate in August 2007. Located 800 kilometers (500 miles) north of the Arctic Circle and less than 1,930 kilometers (1,200 miles) from the North Pole, this sea route remains a significant challenge, best met with a strong icebreaker ship backed by a good insurance policy. Despite the challenges, long-term opening of the passage would have global impacts on trade and natural resource use.

Related

Arctic sea ice shrinks to record low in 2007
(8/15/2007) Arctic sea ice has shrunk to a record low according the Japan Aerospace Exploration agency.

Floating sea ice shrinks in the Arctic
(8/10/2007) By one estimate, the extent of floating sea ice in the Arctic has shrunk more than in any summer ever recorded, reports the New York Times.

Arctic sea ice melting faster than previously thought
(4/30/2007) Arctic sea ice is melting far faster than previously believed reports a new study published in the May 1 issue of Geophysical Research Letters. A comparison of newly available observational data to advanced simulations reveals that Arctic sea ice has been disappearing about three times faster than the average rate of loss projected by computer models. The new research, conducted by Julienne Stroeve of the National Snow and Ice Data Center (NSIDC) and his colleagues, shows that September sea ice extent retreated at a rate of about 7.8 percent per decade during the 1953-2006 period, not the 2.5 percent projected by simulations. The basis for the new data--a combination of satellite measurements and early aircraft and ship reports--is considered more reliable than the earlier records.

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